Introduction to the Bagua Forum: It is located behind Taishi Gate and in front of Taihao Fuxi Mausoleum. The altar is in the shape of an equilateral octagon with straight walls, surrounded by bluestone layers and built with bluestones. The "Innate Bagua Altar" is built with bluestone on the altar surface. The "yin and yang fish" graphic in the middle symbolizes Tai Chi's two yangs, the two yangs and four images, and the four images' Bagua.